1. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb, Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi)

   wobbling; tottering; shaking; unstably; unsteadily

   Onomatopoeic or mimetic word

   テーブルの脚がぐらぐらする。

2. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

   wavering (e.g. over a decision); dithering; indecisively

   Onomatopoeic or mimetic word

3. Adverb (fukushi), Adverb taking the 'to' particle

   boiling up

   Onomatopoeic or mimetic word

4. Adverb (fukushi), Adverb taking the 'to' particle, Suru verb

   dizzily; giddily

   Onomatopoeic or mimetic wordsee くらくら

Also written ぐらぐらguragura